Free-DOS laptop maybe? No extra cost for Windows OS.

Because you paid for something you don't need, lining pockets in the process.

Why having Windows pre-installed when you are sure you won't use it? More, it is very rarely an option available to not get it: I would find interesting that it could be opted-out so people with low budget could skip it and pay less.

Cost, and it'd be nice to know if there is linux compatibility for hardware.